View source for Guava seeds synthesized silver nanowires

=Abstract=
[[File:AgNWs_made_with_guava_seeds.png|thumb|400px|Diagram of the experiment from the paper "UV-Light Mediated Biosynthesis of Silver Nanowires; Characterization, Dye Degradation Potential and Kinetic Studies".]][[File:AgNW growing mechanism.png|thumb|400px|The growing mechanism of Ag-NW and the role of PVP as caping agent. Picture from "A Simple Synthetic Approach To Prepare Silver Elongated Nanostructures: From Nanorods to Nanowires".]][[File:IMG_8514 copy.jpg|thumb|400px|BioClub Tokyo open lab day on Tuesday and its founder Georg Tremmel.]][[File:The love project and Ag-NWs.jpg|thumb|400px|Urs and Miranda in Gaudilabs to repeat the Guava seeds synthesized Ag-NWs experiment.]]
This experiment synthesis Ag-NWs with Psidium Guajava seed, Guava seeds contain some compounds, such as polyphenols and alkaloids, are likely able to reduce silver nitrate to silver and synthesis the silver nanoparticle to "wire-alike" or "flakes" shapes under certain conditions. However, although we obtained the orange solution (which indicate the existence of the silver nanoparticles), but the dried solution didn't exhibit any conductivity, and the SEM result also doesn't show the existence of nanowires. This maybe due to the absence of PVP, the caping agent and the insufficient UV exposure during the synthesis process.
=Experiments=
The experiment process is introduced below in the gallery. The process aims to repeat the result introduced in the paper "UV-Light Mediated Biosynthesis of Silver Nanowires; Characterization, Dye Degradation Potential and Kinetic Studies". The first attempt was made in BioClub Tokyo. Additionally, 3 groups of mixtures with different concentration of guava seed extraction was prepared: 1. silver nitrate solution mixed with distilled water, 2. silver nitrate solution mixed with guava seed extraction heat stirred for 50 mins, 3. silver nitrate solution mixed with guava seed extraction heat stirred for 4 hours. All beakers are put under UV exposure for 4 hours, the color of the second and 3rd mixture were changed from milky white to orange. The orange solution and the aggregations were collected separately, but only the solution was examined by the UV-vis spectrum in Tokyo.
<gallery mode="traditional" class="left" widths=360px heights=240px caption="step by step process">
File:Seed of Taiwan guava.jpg|The seeds was extracted from guava purchased in Taiwan.
File:Powdered Taiwan guava seeds with pestle.jpg|The seeds was firstly dried in oven at 50ºC for 48 hours and then powdered by grinder pestle without filtering.
File:preparation of the extraction of Taiwan guava seed.jpeg|Mix 0.1g of the guava seed powder with 100ml distilled water, and it's stirred with heat stirrer at 40ºC for 50 minutes.
File:silver nitrate solution .jpg|Prepare 1mM silver nitrate solution by dissolving 1.7 grams of silver nitrate crystals in 100 ml of distilled water. Stir it in room temperature until the solution turns clear.
File:silver nitrate solution with guava extraction before UV.jpeg|Mix the silver nitrate solution and guava extraction by the ratio of 2:1. 
File:silver nitrate solution with guava extraction during UV.jpeg|The mixed solution was put into an UV chamber and was exposure for 4 hours in room temperature. All beakers are sealed with cling film.
File:silver nitrate solution with guava extraction after UV.jpeg|The change of the color of the final solutions after UV exposure.
File:final solution of AgNWs synthesis with Taiwan guava seeds.jpeg|The final solution was filtered with filter paper and the color is in orange.
</gallery>
=Analyzings=
==The UV-vis spectrum comparism==
The result of UV-Vis spectrum data can be downloaded [http://https://docs.google.com/spreadsheets/d/1UpdfWLr9N90NuxQ16fV9wc6cabsoONLBazMyCx_sYj0/edit?usp=sharing here].
<gallery mode="traditional" widths=360px heights=240px class="left" caption="UV-vis spectrum result">
File:Shohei Asami.jpg|UV-vis analytic chart was made and supported by Shohei Asami, member BioClub Tokyo.
File:orange AgNWs and clear one2.png|UV-vis graphs of the orange final solution and clear final solution.
File:UV-Vis spectra of P. Guajava extract and Ag-NWs.png|UV-Vis graphs of P. Guajava extraction and Ag-NWs from the paper.
</gallery>
==SEM photography==
Two samples were prepared, the first one is the final solution drop dried on glass, the second is the aggregations collected from the centrifuged final solution. There's no sign shows the existence of the wire-alike shape, indicating the failure of the nano wire synthesis with guava seeds extraction. Only "flake-alike" shape was found in the sample.
<gallery mode="traditional" widths=360px heights=240px class="left" caption="SEM result">
File:centrifuged solution of AgNW.jpg|Centrifuged final solution.
File:AgNW samples for SEM .jpg|The final solution and the prepared sample for SEM. The right one on glass is the drop of solution, the left one is the aggregation from the centrifuge.  
File:low-density-Ag-NW_11.jpeg|The SEM photograph of the aggregated sample under 50 µm..
File:low-density-Ag-NW_12.jpeg|The SEM photograph of the aggregated sample under 10 µm..
</gallery>

=Preferences=
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